
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            padding: 20px;
        }
        
        .container {
            text-align: center;
            background-color: rgba(255, 255, 255, 0.9);
            border-radius: 20px;
            padding: 40px 30px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
            max-width: 500px;
            width: 100%;
        }
        
        h1 {
            color: #333;
            margin-bottom: 30px;
            font-weight: 600;
        }
        
        .counter-display {
            font-size: 120px;
            font-weight: bold;
            color: #2575fc;
            margin: 30px 0;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
        }
        
        .counter-display.positive {
            color: #2ecc71;
        }
        
        .counter-display.negative {
            color: #e74c3c;
        }
        
        .counter-display.zero {
            color: #2575fc;
        }
        
        .buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
            margin-bottom: 30px;
            flex-wrap: wrap;
        }
        
        button {
            padding: 15px 25px;
            font-size: 18px;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        .increment-btn {
            background-color: #2ecc71;
            color: white;
        }
        
        .decrement-btn {
            background-color: #e74c3c;
            color: white;
        }
        
        .reset-btn {
            background-color: #3498db;
            color: white;
        }
        
        button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
        }
        
        button:active {
            transform: translateY(1px);
        }
        
        .keyboard-hint {
            background-color: #f8f9fa;
            padding: 20px;
            border-radius: 10px;
            margin-top: 20px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
        }
        
        .keyboard-hint h3 {
            margin-bottom: 15px;
            color: #333;
        }
        
        .keyboard-hint p {
            color: #666;
            line-height: 1.6;
        }
        
        .key {
            display: inline-block;
            background: #333;
            color: white;
            padding: 3px 8px;
            border-radius: 5px;
            font-family: monospace;
            margin: 0 5px;
            font-size: 14px;
        }
        
        @media (max-width: 480px) {
            .counter-display {
                font-size: 80px;
            }
            
            button {
                padding: 12px 20px;
                font-size: 16px;
            }
            
            .buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .buttons button {
                width: 80%;
            }
        }
